Anchor fasteners are heavy-duty tools used to connect one or more objects to a concrete, brick, or stone surface. Because these base materials do not provide the “grip” that wood or metal does, these fasteners rely on mechanical expansion or chemical bonding to stay in place.
Anchors generally function through three primary mechanisms:
Friction: The fastener expands against the walls of the hole.
Keying: The fastener or the base material is deformed to create a mechanical interlock.
Bonding: An adhesive (epoxy or resin) creates a structural bond between the fastener and the material.
These are the most common mechanical anchors. They feature a threaded stud with a conical base and a small expansion clip. When the nut is tightened, the clip expands against the concrete.
Best for: Solid concrete.
Use case: Securing structural steel columns or heavy machinery.
Similar to wedge anchors, but they have a metal sleeve that runs the full length of the bolt. They are more versatile than wedge anchors because they can work in hollow materials or softer masonry.
Best for: Brick, block, and concrete.
Use case: Mounting handrails or door frames.
These are internally threaded female anchors. You “drop” them into a pre-drilled hole and use a setting tool to expand the bottom.
Best for: Applications where the bolt needs to be removed or replaced later.
Use case: Suspending pipes or ductwork from a concrete ceiling.
A hole is drilled and filled with a two-part resin/epoxy before a threaded rod is inserted. Once it cures, the rod is essentially fused to the concrete.
Best for: High-vibration environments or edge-of-slab installations.
Use case: Bridges, heavy industrial plants, or retrofitting rebar.
| Anchor Type | Base Material | Strength Level | Removability |
| Wedge | Solid Concrete | Very High | Permanent |
| Sleeve | Brick / Block | Medium-High | Difficult |
| Drop-In | Concrete | High | Bolt is removable |
| Chemical | All Masonry | Extreme | Permanent |
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